All of his life, whenever Thomas met new groups of people he felt timid and shy and tended to retreat to the edge of the crowd until he was better acquainted. Thomas' behavior is best described as a personality ____

Positive reinforcement _____ the likelihood that a behavior will recur, and negative reinforcement _____ the likelihood that a behavior will recur

a. decreases; increases b. increases; increases c. decreases; decreases d. increases; decreases

By plotting savings as a function of time, Ebbinghaus created psychology's first:?

a. ?learning curve b. ?psychological law c. ?retention curve d. ?study of meaningfulness